Lighting device



FIG. 1 is a left front perspective view of a lighting device showing our new design;

FIG. 2 is a left back perspective thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The different elements of the claimed design are being shown separated in some figures for convenience of illustration. 

The ornamental design for a lighting device, as shown and described. 